Re: USB gadget regression on v6.4-rc1 and v6.1.28

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On Fri, May 12, 2023 at 12:55:46PM +0200, Stephan Gerhold wrote:
> On Fri, May 12, 2023 at 11:07:10AM +0200, Francesco Dolcini wrote:
> > Hello all,
> > I recently did have a regression on v6.4rc1, and it seems that the same
> > exact issue is now happening also on v6.1.28.
> > 
> > I was not able yet to bisect it (yet), but what is happening is that
> > libusbgx[1] that we use to configure a USB NCM gadget interface[2][3] just
> > hang completely at boot.
> > 
> > This is happening with multiple ARM32 and ARM64 i.MX SOC (i.MX6, i.MX7,
> > i.MX8MM).
> > 
> > The logs is something like that
> > 
> > ```
> > [*     �F] A start job is running for Load def…t schema g1.schema (6s / no limit)
> > M[K[**    �F] A start job is running for Load def…t schema g1.schema (7s / no limit)
> > M[K[***   �F] A start job is running for Load def…t schema g1.schema (8s / no limit)
> > M[K[ ***  �F] A start job is running for Load def…t schema g1.schema (8s / no limit)
> > ```
> > 
> > I will try to bisect this and provide more useful feedback ASAP, I
> > decided to not wait for it and just send this email in case someone has
> > some insight on what is going on.
> > 
> 
> I noticed a similar problem on the Qualcomm MSM8916 SoC (chipidea USB
> driver) and reverting commit 0db213ea8eed ("usb: gadget: udc: core:
> Invoke usb_gadget_connect only when started") fixes it for me. The
> follow-up commit a3afbf5cc887 ("usb: gadget: udc: core: Prevent
> redundant calls to pullup") must be reverted first to avoid conflicts.
> These two were also backported into 6.1.28.

Thanks for the confirmation.

> I didn't have time to investigate it further yet. With these patches it
> just hangs forever when setting up the USB gadget.

I will double check that the same is happening to me and send a revert
afterward.

Francesco




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